This afternoon the Senator's account tweeted, "Dear Iowans, vote against ACTA, SOPA, and PIPA, because this man, Chuck Grassley, wants YOUR internet censored and all of that BS."

Then a few minutes later, more hacked tweets followed. "And yes, I am an Anonymous follower," his twitter account posted, "uh-oh looks like Chuck is online too."

The group Anonymous has protested the two anti-piracy bills, theStop Online Piracy Act (SOPA) in the House of Representatives and the Protect IP Act (PIPA) in the Senate fiercely, targeting websites of members of Congress who have supported the bill.

Called "OpDonkeyPunch," the group claims on their chat rooms and on Twitter they are mounting the distributed denial of service (DDoS) attacks on members of Congress, following last week's coordinated Internet blackout on some websites like Wikipedia against the bills.

Grassley's office today confirmed that his twitter account was hacked while the Senator, who posts tweets directly from his blackberry himself, was traveling from Iowa to Washington, D.C.

When Senator Grassley's staff noticed the hacking after the first false Tweet was posted, the office called Twitter to obtain access to the account so the password could be changed.

"The password has been changed, and Senator Grassley controls the account again," his office said in a statement to ABC News today.

Last week Grassley reversed his support for the Senate's anti-piracy bill, the Protect IP Act (PIPA), starting that while there needs to be a way to stem Internet piracy the Senate bill needs "substantial changes." In light of last week's protests and numerous senators pulling their support, Senate Majority Leader Harry Reid, D-Nev., on Friday delayed a vote on the bill in order to resolve the problems with the bill.

Off topic of their protest over the anti-piracy bill, the protestors also had a little fun while on Senator Grassley's account.

"Really wanted Herman Cain to get president this year," the hackers also tweeted.

All erroneous hacked tweets have been since deleted from the Senator's account.